Waikiki (wĪkēkēˈ) [key], famous beach and resort center SE of Honolulu on SE Oahu island, Hawaii. Tourism is the economic mainstay; Waikiki is known the world over for its beach and recreational facilities, especially surfing. Luxury hotels are abundant. Waikiki has a zoo, an aquarium, exotic flora, and excellent shopping. Fort DeRussy is located there. Diamond Head crater is nearby.